Exercises on Euclid and in modern geometry for the use of schools, private students, and junior university students (1881)
McDowell, James L · Cambridge, Deighton, Bell, and Co. · leaf 103
tersection, or, which is the same thing,by the angle between two radii drawn to a point of intersec-tion, since a radius is perpendicular to the tangent at itsextremity. Two circles are said to cut orthogonally (or at rightangles) when a pair of radii drawn to a point of intersectioncontains a… … 111.] AND IN MODERN GEOMETRY. 75 From P any point outside the circle with centre 0, draw thetangent PA, and from the centre P at the distance PA describethe circle PAC, intersecting the other circle in A and C. JoinPO, OA. Because PA is a tangent to the circle ABC, therefore(III. 18) the angle PAO…
Geometry
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